Trichoderma asperellum biocontrol activity and induction of systemic defenses against Sclerotium cepivorum in onion plants under tropical climate conditions

Publication date: Available online 8 November 2019Source: Biological ControlAuthor(s): William Rivera-Méndez, Miguel Obregón, María E. Morán-Diez, Rosa Hermosa, Enrique MonteAbstractThe biocontrol potential of three native Costa Rican Trichoderma asperellum strains has been evaluated against the necrotrophic ascomycete Sclerotium cepivorum, the causal agent of onion (Allium cepa L.) white rot. In Costa Rica, where climatic conditions enhance the development of this pathogen, white rot reduces onion yields up to 50% of total harvest. In our study, the three T. asperellum strains tested in in vitro assays showed their capacity to antagonize S. cepivorum, with BCC1 displaying percentages of colony growth inhibition of the pathogen of 81 and 90% in dual culture and cellophane membrane assays, respectively. In addition, this Trichoderma strain was able to reduce a 74% the plant mortality compared to untreated plants under greenhouse conditions. In field trials, carried out in two consecutive harvest years and in two different tropical locations, the two tested dosages of T. asperellum BCC1 reduced the incidence of white rot in a 3.41% for the lowest dose and 3.61% for the highest dose when compared to onion plants treated with chemical fungicides. Additionally, a significantly increase of 20.4% in onion bulb yield was recorded for the highest dose of BCC1. The potential of T. asperellum BCC1 to induce systemic defenses in onion plants against S. cepivor...
Source: Biological Control - Category: Biology Source Type: research

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